package com.sky.aspect;

/*
* 自定义切面，实现供公共字段自动填充处理逻辑
* */

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Component
@Aspect
public class AutoFillAspect {

    /*
    * 切入点
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCute(){}

    /*
    * 前置通知，为公共字段赋值
    * */
    @Before("autoFillPointCute()")
    public void autoFil(JoinPoint joinPoint){
        log.info("开始公共字段填充....");

        //获取数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType type = autoFill.value();//注解的类型

        //获取到当前拦截方法的参数---实体类对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        //实体对象
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //判断注解的类型
        if(type == OperationType.INSERT){
            //添加时   添加4个值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射对象赋值
                setCreateTime.invoke(entity,localDateTime);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (type == OperationType.UPDATE){
            //更新时  修改2个值

            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射赋值
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    }
}
